Pipe-threading tool.



B. BURDEN.

PIPE THREADING TOOL. APPLIOATION FILED SEPT. 23, 1908 1,056fi85, Patented Mar. 18, 1913.

2 SEEETSSHEBT l.

COLUMBIA PLANOGRAPH co.,wASHlNGTON, D. c.

B. BURDEN.

PIPE THREADING TOOL. APPIJIQATION FILED SEPT. 2a, 1908.

1,056,085, Patented Mar. 18, 1913.

2 SHEETS-SHEET 2.

wihwooao B W 'QZ B OZ GKQIZ COLUMBIA PLANDGRAFH ccqwAsmNaToN, D. c.

atto'anug UNITED STATES PATENT OFFICE.

BRADFORD BOB-DEN, OF VIARREN, OHIO, A$SIGNOR TO THE BORDEN COMPANY, OF WARREN, OHIO, A CORPORATION F OHIO.

PIPE-THREADING TOOL.

Application filed September 23, 1908.

Specification of Letters Patent.

Patented Mar. 18, 1913.

Serial No. 454,333.

To 207mm 2'2? 722 my concern Be it known that I, BRADFORD BornnN, of lYarren, in the county of Trumbull and State of Ohio, have invented certain new and useful Improven'ients in Pipe-Threading Tools; and I do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Heret-ofore adjustable die stocks or pipe threading tools, of the kind used by plumbers and gas and steam fitters for cut ting tapered threads on pipes, have commonly comprised a rotatable and longitudinally-movable housing or chaser-carrier; an adjuster, in the form of a single element common to all of the chasers; a post or wedge rotatable with the housing, but not partaking of the longitudinal travel thereof, for automatically controlling the movement of the adjuster during the cutting operation; and a work-holder fixedly mount-- ed on the pipe and toward which the chaser carrier travels during the thread cutting operation, the carrier and the work-holder having a threaded engagement, or its equivalent, to draw the former toward the latter. It is upon this wort-holder that the post or wedge has heretofore been mounted in such manner as to rotate-with the chasercarrier but not. to move longitudinally therewith. During this latter movement the adjuster has a movementimparted thereto independently of its rotation with the housing, and being in engagement with all the chasers, simultaneously controls them so as to secure uniformity in recession. This independent movement of the adjuster may be at right angles to the axis of the chaser carrier, as shown in Letters Patent No. 83ft,fl:54r, issued to me October 30, 1906, or it may be concentric to the axis of the carrier as shown in Letters Patent No. 1,005,147, issued to w. A. Neracher and myself October 10, 1911. In the latter instance the adjuster or clrasenengaging plate is rotatable with and independently of the chaser-carrier, and it is by reason of this independent rotation and the cooperation of the post or wedge, that the recession of the chasers is automatically controlled and the cutting of a tapered thread is effected.

The primary object of my present invention is to dispense wholly with the workholders heretofore absolutely necessary in all hand operated tools, and thus avoid the care and trouble required in centering such work-holders on the pipes to be threaded. It it well known that unless the workholder is properly centered the resultant thread will not be in true alinement with the pipes axis, the presentation of the cutting threads of the chasers to the end of the pipe being controlled not by the chasers themselves, but by the position which the chaser-carrier is caused to assume by the positioning of the work-holder on the pipe. T o prevent the work-holders from slipping it has heretofore been necessary to provide special means for firmly impinging the pipe surface, and this has tended to add to the trouble and expense. By my present invention I have produced an adjustable diestock or pipe threading tool, of the kind adapted for cutting tapered threads, composed of less parts than has heretofore been possible, and hence the tool may be made with less expense, and its use attended with but little ditficulty. And a further object of my present invention is to effect the removal of all burs while positioning the tool relatively to the pipe.

The invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a front end view. Fig. 2 is a side elevation, partly in section, Fig. 3 is a side elevation of a slight modification. Fig. 1 is a similar view of a second modification, of which Fig. 5 is a part. Figs. 6 and 7 are details.

Referring to the drawings, 1 designates a rotatable and longitudinally movable housing or chaser-carrier, provided, as customary, with oppositely arranged sockets to ac commodate handles by which the housing may be manually rotated. lVithin this housing or carrier are radially-arranged chasers which, according to known means, gradually and uniformly recede as the threading operation progresses; and such chasers are capable of being adjusted to pipes of different sizes. The adjuster is substantially the same as that shown in Letters Patent No. 1,005,1a7, before mentioned, and comprises a chaser-engaging plate 4 which is shown detachably locked to a second plate 3 by a clamp 5, and as having eccentric slots or grooves (see dotted lines liig. ll for taking in lugs ot the Chasers. The chaser-engaging plate ll not only rotates with the chaser-carrier, but has an in dependent rotary movement relatively thereto. Hence asthe tool is revolved the gradual recession of the chasers will be etl ected resulting in the cutting of a tapered thread. lt known in the art that under certain circumstances the rotation of the chaserengaging plate may be ettected either wnolly by the pressure of the pipe acting longitudinally on the chasers; or by the application oi turning power to the chaser-engaging plate. In either event it. is necessary to control this indepemlent rotation of the chaser-engaging plate, and heretofore the controlling means has b en mounted directly on the work-holder, but according to my presentinvention the controlling means connected to a stop which is designed to engage the end of the pipe being threaded thereby preventing the controlling means "from partaking oi the longitudinal travel of the chaser-carrier. I have shown the stop or pipe-engaging member in the form of a circular body 6 located centrally ot' the tool and having a shank T which fits in a correspondingly formed opening in a cross bar 8 extending at right angles to the axis of the tool lhis crossbar carries two posts 9 which project through openings in the chaser-carrier. These posts, as pointed out in Patent No. 1 005 1 17, have diagonal guideways for taking in the lugs 10 of plate 3 so as to thereby cause or permit rotation of the chaser-engaging plate t during the thread cutting operation. T he shank 7 and cross bar 8 are preferably locked together by a screw 12, but in some forms the bar may be loose on the shank.

On about the same plane as the inner edges or threads of the chasers, I form on the exterior of the stop or pipe-engaging member a circun'iterential shoulder 13 for abutting against the end. of the pipe. This engagement of the stop with the pipe prevents the post 9, cross bar 8, and the stop itselt from partaking of the longitudinal travel of the chasencarrier. and by reason of the engagement between the posts and the chasm-engaging plate (or the plate carried thereby) the independent rotation of such chaser-engaging plate is automatically controlled resulting in a gradual and uniterm recession of the chasers. Thus the necessity of employing and carefully mounting a work-holder on the exterior of a pipe is obviated.

For the purpose of centering or guiding the tool in the performance of its work, I provide it with a guiding agency. The stop or pipe engaging member is shown in Fig. 2 as having a reduced portion 6 for extending into the bore of the pipe and thus term a centering guide which serves to p" nerly di i rect the chasrrs onto the pipe 'w lhout be attached. to the latter as is required i use out work hohh ha also shown the end oi the reduced or center-i; vidcd with rcaniingr; teeth. or rcino. burs as the tool is lJ-ei nto p s: but these may l out pipes of different may be used, and hence I l I 12 one step may l inserted. lint in s nng retain- -i'iovod nd ditlerent steps one i T serve f r pipes n various sizes. i 'or in nice 1e stop may he ,itzi'med with a series ct st '11) shoulders t t S 'CQS. u l

7;,- a kcoininodato pipes nit ii i s event the step will be nected to the cro s bar so th 1 correspoinling with the pipe V o he threaded may be properly positioi'ied rclatirely to the a dd i tional bushing bein shown 7 Fig. J each bushing i held by a szrcvv it stitution of one for another inav b. :n'vcomphshed. l hcse bushings are d to fit on the pipes and form gui tering the tool. l t it he desirh leader screws in connection wit ing tooh a n inte nally thread be held within the tubular cnsion ot the housing by screws 2th such nut l gaged by a leader screw 21.

leader screw 22 is shown in correspondingly threaded nut thereon. which nut may be substituted tor :2 ii t; hand nut shown in Fig. l. But leader screws are olriectiouabla and they are in no sense necessary to the sucresstul employment ot a threading tool embody mg my resent invention. 7 i i I The advantages of my tn'esent imrention will be readily a ipreciated by those skit ed in the art. F lo tar as l am aware l am the first to produce an adjustable di stock or portable pipe threznling hand tool capable of cutting tapered threads on pipes at ditterentsizes without the use of a frame or work-holder fixedly mounted on the pipe. and also without employing" a leader scre or its mechanical e piinlent coiur iei l to or supported by such frame or woi lmlder.

on gtht h at n e before obtained in this class ot hand tools.

" Wendmar This is a desideratmu long lttltl Furthermore, by means of my present invention I am enabled to thread with equal facility pipes which are not even on the end, that is, where the end has not been perfectly cut off, the pipe at one side being of somewhat greater length than on the other side. Under such circumstances the longer prrticn of the pipe will form the seat for the stop, and the latter will not revolve with the tool. Therefore, by removing or loosening the set screw 12 the cross bar may revolve around the reduced end or shank of the stop. 3ut whether the stop revolve or be fixed so that the cross-bar will revolve on the stop, the result is the same, the crossbar will ride and revolve on the end of the pipe. The tool in being applied to and while working on a pipe is guided to its work by centering means carried by either the stop or the housing, such centering means engaging with but not secured to the pipe.

l claim as my invention 1. 4- hand tool for cutting tapered threads on pipes comprising. in combination, a rotatable and longitudinally movable chasercarrier, a series of radially-arranged chasers. a chaser-engaging plate rotatable with and movable independently of said chasercarrier, a post for controlling the independent movement of said plate, said post being rotatable with said chaser-carrier but not partaking of its longitudinal travel, means with which the pipe or article being threaded is designed to engage for acting on said post to prevent itfrom traveling longitudinally with the chaser-carrier, and means carried by the tool for centering it on the pipe without being secured thereto.

2. A hand tool for cutting tapered threads on pipes comprising, in combination, a rotatable and longitudinally movable chasercarrier, a series of radially-arranged chasers. a chaser-engaging plate rotatable with and independently of said chaser-carrier, a member for causing or permitting the independent rotation of said plate, said member being rotatable with said chaser-carrier but not partaking of its longitudinal travel, means with which the pipe or article being threaded is designed to engage for prevent ing said member from traveling longitudinally with the chaser-carrier, and means *arried by the tool for centering it on the pipe without being secured thereto.

3. A hand tool for cutting tapered threads on pipes comprising. in combination, a rotatable and longitudinally movable chasercarrier having a central opening, a series of radially arranged chasers, a chaser-engaging plate rotatable with and independently of said chaser-carrier, a post controlling the independent movement. of said plate, said post being rotatable with said chaser-carrier but not partaking of its longitudinal travel, a guiding agency at the rear of the chaser-carrier, and a cross-bar extending transversely of the chaser-carrier at or near the front thereof and to which the post is connected, said crossbar having a portion with which the pipe is designed to engage for preventing the cross-bar and the post from traveling longitudinally with the chasercarrier.

at. A hand tool for cutting tapered threads on pipes comprising, in combination, a rotatable and longitudinally movable chasercarrier, a series of radially-arranged chasers, a single element common to all the chasers to control the uniform recession there of, a stop designed to engage with the pipe to be threaded, a cross-bar mounted on said stop, said cross bar being revoluble with the chaser-carrier, a member carried by said cross-bar for controlling said single element, and means carried by the tool for centering it on the pipe without being secured thereto.

A hand tool for cutting tapered threads on pipes comprising, in combination, a r0- tatable and longitudinally movable chaser-- carrier, a series of radially-arranged chasers, a single element common toall the chasers to control the uniform recession thereof, means for centering the chaser-carrier on the pipe to be threaded without be ing secured thereto, a stop designed to engage with the end of the pipe to be threaded, and means rotatable with the chaser-can rier and supported by such stop, said means cooperating with said single element as the chaser-carrier travels over the pipe to control said single element.

6. A hand tool for cutting tapered threads on pipes comprising, in combination, a rotatable and longitudinally movable chaser-carrier, a series of radially-arranged chasers, a single element common to all the chasers to control the uniform recession thereof, a stop located axially of the chaser-carrier and designed to project into and engage with the end of the pipe to be threaded, and means rotatable with the chaser-carrier and supported by such stop, said means cooperating with said single element as the chaser-carrier travels over the pipe to control said single element.

7. A hand tool for cutting tapered threads on pipes, comprising, in combination, a rotatable and longitudinally movable chasercarrier, a series of radially-arranged chasers, a single element common to all the chasers to control the uniform recession thereof, a centrally arranged body designed to be supported by the pipe to be threaded, said body having a stop on its exterior for en gaging the end of the pipe, means rotatable with the chaser-carrier cooperating with said single element as the chaser-carrier travels over the pipe to control said single element and a support: tor such means extending radially from paid body at the Front of the chaser-carrier.

S. It hand tool for cutting tapered threads on pipes con'iprisingi in combinatioin a rotatable and longitudinally niorable chaser varrier, a series of radially-arranged chasers, a single element connnon to all the Chasers to control the uniform recession theiveo'li a centrally arranged body designed to project into and be supported by the pipe to be tareadeer said body having; a stop on its exterior tor engaging: the end oi" the pipe in ttl'lS rotatable with the chriser-carrier cooperating With said single element as t 1e chaser-carrier travels over the pipe to control said single element and a support for such means extending radially from said body at the liront. oi the cl'iaser-mrrier.

9. ill. hand tool. for cutting tapered threads on pipes comprising, in con'hination, a rotatable and loiigitudinally inovable chasercarrien: series oi radially ar ringed chasers, a single element conn'non to all the Chasers to control the uniform recession thereof, a cei'itrally-ar hinged body designed to project into and be supported by the pipe to be threaded. n'ieans rotatable with the chasercarrier cooperating with said single element as the chaser-carrier travels over the pipe to control said single element and a support for such HD3118 extending; radially from said body a" the front of the chaserfarrier, said body having in rear of said chasencarricr teeth for reaming the pipe to be threaded.

10. ll hand tool for cutting tapered threads on pipes comprising, in combination. a rotatable and longitiulinall v movable chasertarrier a series of radially-arrai chastu's a single element common to all the chz'isers to control the nnittorni rec ion thereof, a centrally arranged bod y designed to project into and be supported. by the pipe to be threaded, said body having; a stop for engaging the end of the pit e and also having, in rear oi the chas 'carrier, teeth tor ii'eaining such pipe, ineans rotatable with the chaseriarrier iiior cooper-ating with said sintiopies of this patent may be obtained for five cent 3 Chasers, a single element cornn'ion to all. the ehasers to control the uni'torin recession thereof, nieans rotatable with the cl1 ,,1!: '-earrier for cooperating wlth said sur lenient as the chaser-carrier travels over the pipe to control said singz'l elci'nent, and a cross-lair arrangel perpendicularly to the axis of said clniser-carrier and revoluble with the latter and to which said last mentioned means is coiniected, such cross-bar having); means for engaging; the pipe to be threaded to pre'rent such cross-bar from partaking ot the longitudinal travel of the chaser-carrier.

12. it hand tool for cutting tapered threads on pipes comprising, in eoniliii atioin a rotatable and lm'igitudinally movable chaser-Carrier, a series 01" radially-arraLogged chasers, a single element connnon to all the chaser-s to control the uniform recession th reoli, nieans rotatable with the chasercarrier but not partaking at its longit udinal travel for cooperating with said single ole" inent as the chaser-carrier trarels over the pipe to control said single element, a cro s-- bar arranged pependicularly to the and forward of said chaser-carrier and oluble with the latter and to which last mentioned ineans is connected,

said such crossbar being" designed to revolve Clinton ll.'l(tl j to the axis of the pipe, and a stop arrane'et cross bar and with r i centrally of too which tl e pipe is designed to engage.

in testimony whereof, l have signed this specification in the presence of two subscribing witnesses.

BRADFORD BURDEN. ll itnessesz i A. l l imcnnn,

a each, by addressing the Gonnnissioner of Patents.

ashington, D. n. 

